Answered from live records · 2026-09-13
How many Agent2Agent tools are there?
Sato Hub lists 11 listings that implement Agent2Agent: 7 open source, 2 active in the last 30 days, 9 carrying a deploy spec. A count of what this directory holds, not of what exists, as of 2026-09-13.
Each row is a fold over the live directory records on the date shown. The total counts listings Sato Hub holds — an index is never a census.
| Breakdown | Listings |
|---|---|
| All listings that implement Agent2Agent | 11 |
| open source | 7 |
| active in the last 30 days | 2 |
| carrying a deploy spec | 9 |
| with an install we reproduced | 4 |
How this was answered
A count of live records whose canonical standards field contains "a2a". The field means implements; a matching tag means works with, and is not counted.
Every answer on this page is produced by one named function over Sato Hub's live records on the date shown. Nothing is typed by hand, no figure is carried over from a previous day, and an answer with nothing behind it says unknown rather than zero. The Sato Score measures how open, active and verifiable a project is — it is not a safety, quality or returns grade.
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Sources — the projects' own repositories and docs
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Sato Hub. "How many Agent2Agent tools are there?." Sato Hub, updated 2026-09-13, accessed 2026-09-14. https://satohub.ai/answers/how-many-a2a-tools-are-thereData last refreshed 2026-09-13; this page is rebuilt daily. Citations carry the date so a reader can tell which snapshot a claim came from. Catalog data is licensed CC-BY-4.0 and the machine-readable copy is linked in the page's Dataset metadata.